Abstract
Nd3+-doped tellurite glasses are promising materials for thermometers based on the fluorescence intensity ratio (FIR) technique. Nevertheless, at high Nd3+ concentrations, energy transfer (ET) processes such as optical reabsorption and cross-relaxation can affect the Nd3+ emission, which has been little explored in the literature. Therefore, the present work investigated the use of Nd3+-doped tellurite glass (samples doped with Nd3+ at 0.2 mol%, 0.5 mol%, 2.0 mol%, and 4.0 mol%) in fluorescence thermometers, in the temperature range from 299 to 371 K. The results indicate a strong dependence of the FIR parameters on the Nd3+ concentration, due to changes in the emission band profiles caused by optical reabsorption of the Nd3+ emissions and cross-relaxation processes. A decrease of the relative sensitivity of the ratio 4F5/2 → 4I9/2/4F3/2 → 4I9/2 is observed for samples doped with higher amounts of Nd3+. The maximum relative sensitivity at 299 K is 3.00%/K, which is the highest value among the reported Nd3+ ions.
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